US5041777A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Voltage controlled and current limited power supply
Assignee: Nokia of America Corp
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Filing: 1990-09-21
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Granted: 1991-08-20
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Expires: 2010-09-21
Abstract
Abstract A current supply arrangement includes a power transistor (T1) driven by a control transistor (T2). The power transistor switching path is connected between a terminal (UE+) of an unregulated input direct voltage (UE) and a terminal (UA+) of a regulated supply voltage (UA). A first control amplifier (OP1), drives the control transistor via a first electrode (base) thereof and compares a voltage derived from the supply voltage (UA) with a first reference voltage (Uref). A second control amplifier (OP2) compares a measuring voltage (UM) derived at a current measuring resistor (R10) with a second reference voltage. The voltage control and current regulation results in a system having a small number of elements and a sufficient dynamic control range. The output of the second control amplifier (OP2) is connected to a second electrode emitter of the control transistor so that, the control transistor operates in emitter arrangement during active voltage regulation and operates in base arrangement during active current limitation.
Inventors
- 👤 Thomas Riedger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 14:08
CPC Classifications
G; G05; G05F; G05F1/00; G05F1/10; G05F1/46; G05F1/56; G05F1/565; G05F1/569; G05F1/573; Y; Y10; Y10S; Y10S323/00; Y10S323/908
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
133 words
A current supply arrangement comprising: a power transistor driven by a control transistor wherein a switching path of the power transistor is coupled between a terminal of an uncontrolled input direct voltage and a terminal of a controlled supply voltage, a current measuring resistor, a first control amplifier, which drives the control transistor through a first electrode and compares a voltage derived from the controlled supply voltage with a first reference voltage, and a second control amplifier which compares a measuring voltage derived at the current measuring resistor with a second reference voltage, and means connecting an output of the second control amplifier is to a second electrode of the control transistor whereby the control transistor operates in emitter arrangement during active voltage regulation and operates in base arrangement during active current limitation.
Claim 2
Dependent Claim
133 words
A current supply arrangement comprising: a power transistor driven by a control transistor wherein a switching path of the power transistor is coupled between a terminal of an uncontrolled input direct voltage and a terminal of a controlled supply voltage, a current measuring resistor, a first control amplifier, which drives the control transistor through a first electrode and compares a voltage derived from the controlled supply voltage with a first reference voltage, and a second control amplifier which compares a measuring voltage derived at the current measuring resistor with a second reference voltage, and means connecting an output of the second control amplifier is to a second electrode of the control transistor whereby the control transistor operates in emitter arrangement during active voltage regulation and operates in base arrangement during active current limitation.
Claim 3
Dependent Claim
32 words
A current supply arrangement as claimed in claim 1, wherein said connecting means comprise a resistor connected between the output of the second control amplifier and an emitter of the control transistor.
Claim 4
Dependent Claim
31 words
A current supply arrangement as claimed in claim 2 wherein an inverting input of the second control amplifier is connected via a resistor to said terminal of the controlled supply voltage.
Claim 5
Dependent Claim
25 words
A current supply arrangement as claimed in claim 3 wherein the first and the second reference voltage are obtained from a single reference voltage source.
Claim 6
Dependent Claim
26 words
A current supply arrangement as claimed in claim 3 further comprising a rectifier diode connected in parallel opposition to a base-emitter path of the control transistor.
Claim 7
Dependent Claim
27 words
A current supply arrangement as claimed in claim 5 wherein the first control amplifier is fed back negatively via the series-combination of a resistor and a capacitor.
Claim 8
Dependent Claim
26 words
A current supply arrangement as claimed in claim 5, wherein the second control amplifier is fed back negatively via series-combination of a resistor and a capacitor.
Claim 9
Dependent Claim
31 words
A current supply arrangement as claimed in claim 1 wherein an inverting input of the second control amplifier is connected via a resistor to said terminal of the controlled supply voltage.
Claim 10
Dependent Claim
25 words
A current supply arrangement as claimed in claim 1 wherein the first and the second reference voltage are obtained from a single reference voltage source.
Claim 11
Dependent Claim
26 words
A current supply arrangement as claimed in claim 8 further comprising a rectifier diode connected in parallel opposition to a base-emitter path of the control transistor.
Claim 12
Dependent Claim
26 words
A current supply arrangement as claimed in claim 1 further comprising a rectifier diode connected in parallel opposition to a base-emitter path of the control transistor.
Claim 13
Dependent Claim
27 words
A current supply arrangement as claimed in claim 1 wherein the first control amplifier is fed back negatively via a series-combination of a resistor and a capacitor.
Claim 14
Dependent Claim
27 words
A current supply arrangement as claimed in claim 12, wherein the second control amplifier is fed back negatively via a series-combination of a resistor and a capacitor.
Claim 15
Dependent Claim
27 words
A current supply arrangement as claimed in claim 1, wherein the second control amplifier is fed back negatively via a series-combination of a resistor and a capacitor.
Claim 16
Dependent Claim
31 words
A current supply arrangement as claimed in claim 2 wherein at least one of said control amplifiers is fed back negatively via a series combination of a resistor and a capacitor.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-08-19 | 1995-02-18 | 1995-08-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-08-19 | 1999-02-18 | 1999-08-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-08-19 | 2003-02-18 | 2003-08-20 | $7700.00 | Window Closed / Lapsed |